Shallow Convection Datasets Simulated by Different Large Eddy Models
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The datasets contain four shallow convection cases (RICO, BOMEX, ATEX, and ARM-SGP) simulated by three large eddy models (SAM, WRF, UCLA-LES). For each convection case, there are nineteen two-dimensional variables, including winds, temperature, and humidity. Three types of plumes are provided, i.e., convective core refers to rising plumes that have positive buoyancy and contain condensed water, and convective updraft defined as plumes containing liquid water and upward vertical velocity, and cloud defined as grid points containing liquid water. Conditionally sampled variables such as in-cloud temperature, moisture and vertical velocity are also provided, which are indispensable for calculating entrainment rate. These datasets will be used as a reference to help users verify and improve parameterization schemes of shallow convection. Table 2 List of the LES output variables Variable Long name Unit U Zonal wind m/s V Meridional wind m/s W Vertical velocity m/s W2 Variance of vertical velocity m2/s2 QT Total water g/kg QV Water vapor g/kg QC Cloud condensate g/kg P Pressure hPa Z Height m A_cor Core fraction 100% A_upd Updraft fraction 100% A_cld Cloud fraction 100% QT_cor Mean qt in core g/kg QT_upd Mean qt in updraft g/kg QT_cld Mean qt in cloud g/kg W_cor Mean w in core m/s W_upd Mean w in updraft m/s W_cld Mean w in cloud m/s QTFLUX Total water flux W/m2
本数据集包含由3套大涡模式（SAM、WRF、UCLA-LES）模拟得到的4个浅对流个例（RICO、BOMEX、ATEX、ARM-SGP）。针对每个对流个例，数据集共包含19组二维变量，涵盖风场、温度与湿度要素。 数据集提供了3类羽流定义：对流核心（convective core）指具备正浮力且含有凝结水的上升羽流；对流上升气流（convective updraft）定义为包含液态水且具有垂直上升速度的羽流；云体（cloud）则指包含液态水的网格点。 此外还提供了条件采样变量，如云内温度、湿度与垂直速度，此类变量是计算夹卷率的必备输入项。本数据集可作为参考基准，助力用户验证并改进浅对流参数化方案。 表2 大涡模拟输出变量清单 变量代号 变量长名称 单位 U 纬向风 m/s V 经向风 m/s W 垂直速度 m/s W² 垂直速度方差 m²/s² QT 总水含量 g/kg QV 水汽含量 g/kg QC 云凝物含量 g/kg P 气压 hPa Z 高度 m A_cor 对流核心占比 % A_upd 上升气流占比 % A_cld 云量占比 % QT_cor 对流核心内平均总水含量 g/kg QT_upd 上升气流内平均总水含量 g/kg QT_cld 云区内平均总水含量 g/kg W_cor 对流核心内平均垂直速度 m/s W_upd 上升气流内平均垂直速度 m/s W_cld 云区内平均垂直速度 m/s QTFLUX 总水通量 W/m²
